.counter span{
    height: 40px;
    width: 50px;
    padding: 0 20px;
    background-color: aliceblue;
    float:left;
    display: flex;
    justify-content: center; 
    align-items: center; 
}
.counter #reduce {
    height: 40px;
    width: 50px;
    border: 10px;
    border-radius: 10% 0 0 10%;
    float:left;
}
.counter #increase {
    height: 40px;
    width: 50px;
    border: 10px;
    border-radius: 0 10% 10% 0;
    float:left;
}
